the eye unaided by any optical instrument that alters the power of vision or alters the apparent size or distance of objects; "it is not safe to look directly at the sun with the naked eye"
increased pressure in the eyeball due to obstruction of the outflow of aqueous humor; damages the optic disc and impairs vision (sometimes progressing to blindness)
the spatial property of the position from which something is observed
a mental position from which things are viewed; "we should consider this problem from the viewpoint of the Russians"; "teaching history gave him a special point of view toward current events"